Method for drilling and applying brake-band linings



May 13 1924. 1,493,521

C. E. CORSON ET AL METHOD FOR DRILLING AND APPLYING BRAKE BAND LININGSOriginal Filed March 25. 1922 W W I Patented May 13, 1924.

UNITED STATES PATENT- orrlcs.

CHALON E. CORSON AND WILLIAM A. WRIGHT, F BRIDGEPO RT, CONNECTICUT.

METHOD FOR DRILLING AND APPLYING BRAKE-BAND LININGS.

Original application flied March 25, 1922, Serial No. 545,567. Dividedand this application flied larch O,

. 1924. Serial No. 897,428.

This invention is designed to facilitate the application of linings tobrake bands and the present application is a division of our applicationSerial No. 546,567, filed March 25, 1922. It is characterized, in thepreferred construction and operation, by the use of the brake band as atemplet and anvil for a drill having a registering device forpositioning the band and lining so that the tool, ada ted for boring acountersunkhole in the lining, will form such hole in registration withthe hole in the band, theband and lining being rivetedtogether--withoutseparating them between the drilling and rivetingoperation. with the result that the work 25 is done rapidly andcorrectly.

In the preferred practice of our method, an end of the liningis engagedagainst an end of a curved apertured brake band and pressed againstasupport. While pressed against the support by the curved band, thelining is drille and countersunk from its face opposite the band to forma rivet-hole in registration with a band aperture, and the ends of theband andlining are then riveted together. The opposite end of the liningis similar] engaged with the corre sponding end 0 the curved brake band,pressed thereby against a support, drilled and countersunk from its faceopposite the band while pressed thereby against the support, and thelining and together. The intermediate portions of the lining are thensequentially engaged against the band and pressed against the su port,and while so ressed the lining is rilled and countersun from its faceopposite the band. The intermediate band and lining sections are th%nriveted together. tening both en" -of the lining to the brake 50 handand thereafter pressing the linin against the support by means of theban and ends riveted By fasthe lining is subjected to tensile andcompressive forces while being drilled and countersunk from its faceopposite the band to form rivet-holesin registration with bandapertures.

By our method it is practicable to rapidly and accurately apply liningsto brake bands, with avoidance of the difficulties heretoforeexperienced in correctly positioning each of the many apertures inregistration with the band apertures by a separate adjustment of thelining in ma ing each aperture with a loose end of the band constantlyin the way, or where the unlined surface of the band, is of irregularshape due to clevises or protuberances thereon. Our method insures theprovision in the lining of rivet holes drilled upon an accurate radiusand of such cross section as to permit free insertion of the rivet andprovide for secure engagement of the rivet -head when upset, withavoidance of the difiicultiesincidentto applying to a curved surface alining which has been .drilled while fiat.

Our improved method is preferably practiced by the use of mechanismhaving a work support formin a rest for a lining on a band, a revolub etool for perforating and countersinking the lining, one of such membersbeing suitably movable toward and from the other, and a guide visiblyindicating the position of the tool when the latter is the mechanism,and Fig. 4 is a sectional view taken axially through the drill chuck ofa modified construction.

The mechanism 'illustrated comprises a frame 1 provided with thehorizontal bearhugs-2,. in which isjournalled the shaft :3' havingthebeveledgear 4 fixed thereon, and

the vertical bearing 5, in which is jonrnalled the spindle 6 having the.beveled gear 7 fixed thereonin e'nga ment with the gear 4; the

shaft 3 being riven by-the motor 8 and driving the spindle 6 through thegears 4 and 7. Y 7 i The spindle 6 is provided with the tool holder 9 inthe socket of which is held the drill bit 10 by the set screw '11, thebit 10 passing through the bearing or work support 12 provided with theaperture 13 therefor. The bearing 12 has the bifurcations or legs 14which are movable to effect adjustment in the vertical ways 15 of theframe, one of the legs having therein the vertical slot 16 through whichpasses a screw 17 into the frame to hold the bearing at the desiredelevation. Y

Levers 18, fixed together by a cross piece 19, have the aligned fulcrums20 carried by the frame and upon which they are ada ted to oscillate asan integral construction aving bifurcations on opposite sides of thebearing 12. A coiled spring 21 connects this lever mechanism with theelbow arm 22 carried by the frame, whereby the mechanism is elevated,and a screw 23, movable through the member 19, engages the frame tolimit the downward movement of the lever mechanism so that the tops ofits bifurcations on either side of the bearing 12 shall be approximatelylevel with the top thereof,

A guide rod and position finder 24 is movable freely through thehorizontal member of the arm 22 in line with the bit 10 and into contacttherewith, the rod having the laterally projecting part 24' at its tofor preventing it from falling through t e arm or limiting its downwardmovement and serving as a handle.

The work to be done involves the drilling of the fabric brake bandlining 25, so that it shall have counter sunk holes 26 thereinregistering with the holes 27 in the brake band 28, and the attachmentof the lining to the band by the rivets 29 having their heads disposedwith the counter sinks.

In carrying out the operation, the lining 25 is placed in the desiredfinal relation to the hand 28 and, thus arranged, the lining is placedon the bifurcations of the lever mechanism 18 and over the bearing 12 sothat the liner or guide rod 24 will enter the hole 27 in registrationwith which a hole 26 is to be drilled in the lining. The band and liningwith the supporting mechanism 18,n0w being moved downward, the tool orbit 10 suitably constructed therefor bores a hole 25 through the liningin registration with the hole 27 in the band, the point of the toolpassing through the band and elevating the rod 24 in pountersinking thehole in the lining, which countersinking is limited b the engagement ofthe lining with the aring 12 and the relation of the bit 10 to suchbearin band; rivets 'are set'therein, and with these rivets as ananchorage the lining is st rctched in the desired final relation'to theband, the further holes required are drilled therein as described andrivets are passed through such holes and the registering holes in theband, 'where they are upset to secure the parts together. 7

Owing to the fact that the lining is bent to conform with the curvedband, the fibres in the outer surface of the lining are stretched andthe fibres in the inner surface of the lining are compressed during theoperation of drilling the holes so that the apertures formed in thelining by the drill are on proper radial lines and are of uni form crosssection and consequently the rivets are easily passed through suchapertures.

As illustrated in Fig, 4, the adjustable bearing 12, for limiting thedownward movement of the lining and the depth of the countersinks formedtherein by the drill bit, may be omitted and a bushing 30 placed on thebit so as to rest on the tool holder 9 and project upwardly so as tolimit the downward movement of the linin on the bit, bushings ofdifferent heights lieing used as may be required by the thicknesses ofthe linings and the depths of the countersinks re uired.

aving described our claim: v

1. The method of securing linings to curved apertured brake bands whichcomprises engaging an end of the lining against the band and pressingthe lining against a support, drilling and countersinkmg thelininvention, we

ing from its face opposite the band while pressed against the snzpportb3 the band, of sai lining and riveting t e drilled en band together; enaging the other end of the lining against t e band and pressing thelining against a support, drilling and countersinking the lining fromits face opposite the band while pressed against the support by theband, riveting such drilled end of the lining and band together; andengaging intermediate portions of said lining against said band bypressing the lining against a support, drilling and countersinking thelining from its face opposite the band while curved and ressed againstthe support b the band, and riveting the interm 1 ate rilled sections ofsaid lining andband together.

2. The method of securing a lining to a curved apertured brake band,which comprises fastenin both ends of the lining to the brake banpressing intermediate sections of the lining against'a support, drill-1T1g and countersinking said lining from its face opposite the band inre istration with apertures of said band while curved and against saidsupport and band, and

rivetin the band and lining together throu the drilled holes.

3. apertured brake bands, which comprises enaging the lining to a curvedsurface of the and and subjecting the linin to tensile and compressiveforces and rilling and e method of securing linings to forces.

with band apertures while subjected to such In witness whereof we havehereunto set our names this 28th do CHALO WILLIA of Februa 1924. E. CORSN. M A; WRIGHT.

